Furnace.



PATENTED DEC. 15, 1903.

J. D. SWINDELL.

FURNACE.

APPLICATION PILEDPEB. 10. 1903.

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PATENTED DEC. 15, 1903/ J. D. S WINDBLL.

FURNACE.

APPLICATION FILED FEB. 10, 1903,.

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INVENTOR.

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' Units terns i atented December 15, 1903.

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JAMES D SWINDELL, OF PITTSBURG, PENNSYLVANIA, ASSIGNOR TO AMER- IOAN FURNACE AND MACHINE 00., OF PITTSBURG, PENNSYLVANIA.

FU RNACE.

SPECIFICATION forming part of Letters Patent No. (47,020, dated December 5, 1903- Application filed February 10, 1903. Serial No. 142,742. (No model.)

To ctZZ whom it may concern.-

Be it known that I, JAMES D. SWINDELL, a resident of Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Furnaces; and I do hereby declare the following to be a full, clear,'and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to an improvement in furnaces, an object of the invention being to provide an improved furnace in which all smoke and gases will be consumed and not escape through the smoke-stack.

A further object is to provide an improved bridge-wall for a furnace.

With these objects in view the invention consists in certain novel features of construction and combinations and arrangements of parts, as will be more fully hereinafter described, and pointed out in the claims.

In the accompanying drawings, Figure 1 is a View in section illustrating my improvements. Fig. 2 is a view in section on the Fig. 3 is a view in section on the line b b of Fig. 1, and Fig. a is a View in section on the line o of Fig. 1.

My improved furnace comprises a base 1, sides 2, ends 3, and a bridge-wall 4, all of masonry and supporting a tubular boiler 5. The boiler 5 is supported at its front end on the front wall 3 and at its rear end on the arch 6, which latter also serves as a deflector to retard the escape of the gases and products of combustion.

Between the front wall 3 and the bridge-wall 4. an inclined grate 7 is provided and slopes from the front wall down to the lower end of the bridge-wall, where a water-seal ashpan 9 is located, and a small space is provided between the lower end of the grate and bridgewall, through which the ashes fall into the pan 8, and the fuel is supplied to said grate through a doorway 9 in the front 3. Air-inlet pipes 10 are provided at each side of the front of the furnace and communicate with a pipe 11, disposed beneath the grate 7, and steam-blast pipes 12 communicate with the air-inlet pipes 10 and through which a blast of steam is discharged into pipe 11 and draws the air in with it to form a mixed air and steam blast beneath the grate to supply the necessary draft to practically consume all the fuel on the grate and create an intense heat beneath the boiler and in front of the bridge-wall. The bridge-wall 4 is made with a forwardly-projecting arch 13, which overhangs the grate and beneath which the flame impinges and is deflected around the forward end of the same and over the wall and carried down by the arch 6 and passes through the boiler and up the flue 14 at the forward end of the furnace, as shown.

A series of air-inlet ducts or flues 15 are provided in the base 1 of the furnace and communicate at their inlet ends at the rear of the furnace with the outside air and extend up through the bridge-wall 4 and discharge into the fire-box beneath the arch 13, and airinlet flues or ducts 16 are provided on opposite sides of the series of fines 15 and extend clear to the front of the furnace, as shown at 16, thence up and back through the side walls 2 to a point in rear of the bridge-wall at, as shown at 17, and again up and forward to the front wall, as shown at 18, where they are connected by short ducts 19 with an airoutlet chamber 20 in front wall 3, which latter is made with a series of outlets 21 to discharge the air (which is highly heated by its long passage through the wall of the furnace adjacent to the fire-box) into the top of the fire-box, and, together with the air supplied through the does 15, feed suflicient heated oxygen to consume all gases and prevent the escape of smoke from the furnace.

Various slight changes might be resorted to in the general form and arrangement of the several parts described without departing from the spirit and scope of my invention, and hence I would have it understood that I do not wish to limit myself to the precise details set forth, but consider myself at liberty to make such slight changes and alterations as fairly fall within the spirit and scope of my invention.

Having fully described my invention, what I claim as new, and desire to secure byLetters Patent, is-

1. In a furnace, the combination of a firebox, air-ducts in the base of the furnace and extending from the rear thereof, said ducts terminating at the top of the bridge-wall and discharging into the rear of the fire-box, and an air-inlet duct extending from the rear of the furnace and communicating with a chamber in the front wall of the furnace opposite the bridge-wall, said chamber discharging into the front of the fire-box opposite the bridge-wall.

2. In a furnace, the combination with a base, front and side walls, a fire-box and a bridge-wall, the bridge-wall having a vertical duct open at its upper end and the front wall having a chamber opposite the upper end of the bridge-wall, said chamber communicating with the upper end of the fire-box, of an arch projecting from the bridge-wall over the upper end of the vertical duct therein and overhanging the fire-box, ducts in the base and of the furnace open at the rear end of the latter and communicating at their forward end with the vertical duct in the bridge-wall, other ducts in the wall of the furnace, open at. the rear end of the latter and extending back and forth in the wall of thefurnace, said lastmentioned ducts communicating with the chamber in the front wall of the furuace.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

JAMES D. SWINDELL.

Witnesses:

F. O. HENZI, J AS. H. SWINDELL. 

